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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8571a60406067e709699e3efe6301ae559bc13cd0988f4ee2e6f425d9b81fd7b' 
  AND token = 's/zj+DretfwuoBqAQyRjeLVtBasb/h9DjXkKnz6FmkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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