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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41b6591cfde04d7f59b58ee4053031cdb771764de34b7a08c305955954255439' 
  AND token = 'nFK/V4ELi8SGABLbT3nePMNL2x9h+kGCNJO4qm7NDEE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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