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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1d04c77b31a71903174a3538c5471e477ef9421c5c89a27d69623494ec2902' 
  AND token = 'K9G3s+CotjNN3N4ltt/wfA7KsqImXNu2T/p4Fe+42B4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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