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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb40c2d529b6365476353b459334dc0a41947dc27605173dac592d248d68e16d' 
  AND token = 'eZGB1mpiy3YTDsKN70e0yXf+c6T6WiIbq1a62EiBRRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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