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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '898e132a0035081fa2f5a8e231d0eca004f0d0d88cb06181f8498ce12d0d5afd' 
  AND token = 'jCc7EKi27gArtvShPyur88ixJFJR9iQEBY+QeG2+RxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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