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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe93046f273f1c91d910732bccfecfb9ed908230c0b34eb6231d3045d488dbd6' 
  AND token = '/WqQOIfcW64EKGd7UrhthfgZZnLn9c7N9Pgy+TA+E78=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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