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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71156b50dfa757af2acd51238f2d78bb225697be5e6a929eecb2382bf5e1c2aa' 
  AND token = 'RhfhEiQtM2OUyxtlfthlA3H1YOqVBxn8GC+9y0Ls2yU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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