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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3c952e8f05ad7418297e9216920d047e0d7c75d41680299781ceb4e593cf57a' 
  AND token = 'CorTD3Pndu3ikV3kkRaeAdexSCzUgqfkch6knq98Z04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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