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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb9738d929a40d086e90f24c7fe107599af6c723de4b21533baaa98c1803890' 
  AND token = 'b+vli67r59l/Uj18pvA6YFNvjg6HDioytp5NCVuleUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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