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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0b067e557aeec5ccbcad5c9b46b2217906c5dc44ae068ea374eaa29a9502c89' 
  AND token = '/n/+8Gy8k47oN332iIlHISBWLAQ0wMQ8hthMSCq6AAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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