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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1679e742842d8c913f3566f93a3d0ac4e59deadffc39eec79a7b7ee38fda2a0' 
  AND token = 'eppDF6HObiZQ/1MP0+/bDVd4KT66R5nQE7mNS66Yynk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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