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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ba3752fc3310ddaff2c62cf4be1dab60f126606fdeecef64d9a5d1034059e92' 
  AND token = '9S3fnDiA59Q37RKCG0egK4bYt73Xojb1G/da/cPhRUY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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