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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a164339cd2337734cb05938d4df705e46a0a7b7c7b22b8e4990f47d38c78cc1' 
  AND token = 'bVdEJSSERxz10eV/nnbIn8YE/pCFddsMI9GB/m9I6lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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