SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfd0b0e0f805a9c9f18f0dd6c68c64e2bc47df468b37d0781b567632a7f798a0' 
  AND token = 'qV4trV5mYzX4UzMNIAbUSj1AGXIKVu51hZ7jwBwEYEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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