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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c627c3d8aa70477097961e6b189123a70692a86ff0c2a1c9d861d77367b00f1' 
  AND token = 'XBSPrf02QyeuSiKhLLKkqumVDtlhKs7iGdbA5qxP+aI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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