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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6361c8eb45fc186694817fe454b76f6e8a2ca711754e39bab522dc7b5f4ca75b' 
  AND token = 'M3ZSWBI7mi/vV3FgFiVH3q3w0A01U8aK6n7LjEfI5mo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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