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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0839504205f32dd6744fd21965390c115a53013aa5291a1a6d515299779e7feb' 
  AND token = 'HfTznFW8rgwbakRRgAOYbJaZqVKxSZmEHo3yOC42U4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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