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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e52501f1c32e627fb9bee01f81646589ded9f712aa3a6ea80af46da11c9d4bd' 
  AND token = 'Y15EoEfeYpd5qgJvFTIsBTG225oWHfY71mSct3wq/7E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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