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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aa0262b7037283b23be5bc69143bec5999a3ae00e4e980b1ef7dc0548eb3e90' 
  AND token = 'pLu84mMApON2TdFmod9TjAgWVbTJAqblX9E3wBZp3Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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