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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93d5cda9471c0eea02936d0aed30d037377489bcc297dad8005795868b57bda3' 
  AND token = 'zxQftqXTXbZCh6Rr5kuluuzQwM2shdg0u6XRpnl8HiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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