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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e8b94dd87b7830c0731319c3243935a644555a9dc65343c22e8b5a0741daf59' 
  AND token = 'HaNLsf312JC1clex4VolvF8d6P+9MOUQDLUFpGoRIiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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