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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce567d2455d1af9c46d7c900275ef126cef4f58656c1fb2aea9a349ac0e9b785' 
  AND token = 'QLwi1g1P9LCuugOv6mEUJgz/DFONfNGBBXlkS3gkR14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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