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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84f057cadeb6e453e41479050efbb1502855123c48b6bfa2fbc860057563383' 
  AND token = 'o5aXgK5KU8FdPhqRgRW4w5kL0wBkIdYLO/HMTpLptkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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