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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0afd1b497a372aad73422e0f35caf98a3457b582e2fa1efe052758a54a9daf2c' 
  AND token = 'yDY/oVLHAEXsPz3vplZ7s5VuW4+jv7uCXjQ5m2ukgSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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