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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dd964fad86464af28055967805080bdbf1f65d5a66b62232d48ecfe7443b557' 
  AND token = 'Lljbwu3GWx27LUgrSxrkv7Ht5WSIkeFM7o1RFVJnj9U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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