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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bd37b611fb02646c2fde426fbd66ca1542a73939bd00c99569693b490cf1b8d' 
  AND token = 'n/ePZZ/4OwYyHGH7AOfJd13mX4XM3RzN6LjxGxuLEOw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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