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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7baf3c07c683ba49ce8c22b208a2adf3cf04251fff90daa469190e394859a3' 
  AND token = 'BvQ2+X1lCqMCIEcck/4pLQYitPIzIZUM+ZGktiI87QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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