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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf78b357272d28f5b7b28c86b11d3d6a98190626724dc752f97c4552396287cb' 
  AND token = 'l+pOeDmYueh/tvVzknucTp3lAifD3QjemdaFRS51iA8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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