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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93cc1cd121f10000a5f67580b08661989af1e17e526488ff5d93bf554aa77fc9' 
  AND token = '02k96Q033hokSbTPKdkMVMMUsl4tf00Wew9dlIKnVDI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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