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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51c6fbbd28f9cd0d7761e9a01108c0ea7260bebdbbfbaf2daf83881df37a388c' 
  AND token = 'orICNpNwRWG95EHVZeAN3w3TDX5clyE/f2UBP6YvLFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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