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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdacc374483eafefc0f5cee22e19ab304e5cc6fa8fced785cafc69f86de2d846' 
  AND token = 'uee+FCAkLPJPLJEe+SBWyH97esKHEWYJ7lB5Ey4kPGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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