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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9196096d0522b561b528ac2ecd2a1c21a94337087b3ba82f33089bd50a12ae3' 
  AND token = 'qy9af550rpQ8K3lTipR2Jaz0O2CXB3Wc3Mw6GSu9jUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}