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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9c8d97248dcfdc8098fe23473a6b7d97cf24a9da06ad962fd08da6b195ccd20' 
  AND token = 'Bb63OagS6AwCubcswZzyZLmIsdSA6aRjgIOj/64txUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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