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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1038dba26c79475b1534b0ebfb353720a0adcff1f7481363252963b98c397f7b' 
  AND token = 'FA+WnqMj2SdMFZ1krdSD+3kBscxY/7RuBICIy9MdOsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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