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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84e27ff54b433b51460cf3f9a413a6eb1aa4b75c4ae98f00599fcf7e59c0fe83' 
  AND token = 'I5C0GQH0UQcD5xc4+wWbw1wHVhvhLUiMxlTAQbO7Sxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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