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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0815339c5aa678e5ca98318f30d05b0ab541d15c2a11b4eec449f260e70f652c' 
  AND token = '7nVbyXxbbCHBFOUxdOvs0XUx7aKQZqMJ6eYE5ED3JuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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