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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd7d590bca2f35c77603c473f425710e439449b09191cd3b4e81f83a3a9c974d' 
  AND token = 'TUsvas8h4lFNk0H8CaiAk7H5tYflJE7eZSu5pluWdIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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