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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be13db0d4126f6c865f2d6446f8564a3d10b21e0fd7419a0e53130890b75e6a5' 
  AND token = 'bCMSd1Ypg7EdhgTx4wvZ0bQtddQsRgGrue+yo3b8i7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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