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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f91ce98c7810f6efe5d9f1b1049b800d62b597702f4ec5b29c7cf6bcf551e2a6' 
  AND token = 'pJzvLvY36UDSWkW9h6sr4aGuaf9bvu3YO6AOrgc0g6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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