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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6e47f3ab0d10a304302dd9812999aea62254b78d6d850bcdcd6c4ea450e616b' 
  AND token = '1AKO4WifSwH+Qe8DBALUpd3d7nCSPWsGrAAQVMA1yaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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