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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd787ac2af1e553cc9fd49f309ca52bf56347282ed90780d1fef01b9a257fe694' 
  AND token = 'EtJdgVHu4Ipn8XeBmN2mOs87roeYWwGAQAzrhjmzP20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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