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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6875f657351655bba1b83fe2c02b9ecf2e68fb03ef6b2745df76862dfd6454f' 
  AND token = 'c5RZ2J8KnlgYRJ63N7NxdDI9N5BqhRoehfLkLD+KXLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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