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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '691e861fc9ea95da2ca87da908f805e0d248009d60fb84f2c2c1b764ebc6ab41' 
  AND token = 'tfNz1/AAL2KiUq/9S80OjEmjxOwYwP5qwzVT6Z9I82M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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