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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825952246e93a47e703e9d0aef1b9cc581ce8a345c7b63739771e78a57696c6d' 
  AND token = 'JBG0m43FacMY0oDQlb7jLkhtIuygrXjnK1zJyj2F6ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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