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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503145e8672deda6cf327657c4741f6b486800aa47d1f35c0a26271b33bee1fd' 
  AND token = '3vL1Z2iPHvNsLTtJyLXW5qVTjru/613PlrRUbEe8mV8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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