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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0233c7c62d51c2646e1886e7a3171ab97b8b1070e69a2fb8aea8949904d7b99' 
  AND token = 'XeUe0cin3nBb02ughjj1RA5moN3Yk4Hyf8aAFL754/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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