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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40ffd78489130ad92d877d6b7e7934c8968c342efaf01b0fc67caeb4a039fd5e' 
  AND token = '1TGU27JyG8AnOfuBGyGEx/c86XGVhCeqCSKRbRirDS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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