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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64c833146f0761b8b1310b6d1573912afa038a0af2b624745cdd18f1f65ad876' 
  AND token = 'UwIeNLlIgBImlYS+5FxDsL0Nme5LoQ1WV6eXjV2FYBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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