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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cce0ced46c18bba3947c3f721fb61669d2172ffd39bd592a18028257db49470' 
  AND token = '7LL6p+QUyuRaDO37NTclP0d6TP8zM58JglzQ+HJ6qtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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