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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5cf309f0bd99254fc4d6d9366bdfc6f3eeba459d095b1b74ec06ad065bd5f78b' 
  AND token = 'v3hN8txTQMXRcUo8a3O0fIkLuAhRDHgUsEEoMP1S6to=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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