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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0a334689ae137459cca6c8a22ee7591f163dad1466ac82a9895c2857b8051c7' 
  AND token = 'eq67D0nO+HFBtu/x20mWXzFV5Gvio3WCiV6npFz2g6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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