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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84a0af63b1434bca4a30284d6e9843cbbd400e5ec0cc61599ec88e3b4c824b2f' 
  AND token = 'wfPFU1kUqj8Rzk6DeDZXQ7q6Fmjts+bPbnS8PG0iZvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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