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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1bc7367e396a3f57230846c34cf869239e5a2b68c1b76aae568b69a72940efd' 
  AND token = 'NC92ttLO5P0ERckQUL2DD9eKM8AJBXrvdF6VUEwAFaM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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