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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc654b7e6b0ed7c985ba8ed1613c7893d58b69c6824bfcb318103124e8ca5c7c' 
  AND token = 'R+Rq4DKGiZSnU0QO6s50KqOEwwF9VoqZy8ffVjOoUDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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